Journal of Medical Oncology and Therapeutics

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Comparison between Ki-67 biomarker expression in primary Breast Cancer before and after neoadjuvant therapy

12th World Cancer Congress
July 23-25, 2018 | Moscow, Russia

Jamal Zidan, Maayan Galer, Sergio Shvalb

Bar-Ilan University, Israel

Keynote : J Med Oncl Ther


Background: Neoadjuvant treatment (NAT) followed by surgery has currently become a part of standard care for patients with locally advanced breast cancer. Postopeartive treatment is generally established on the same detective biomarkers (estrogen receptor, progesterone receptor, HER2 and Ki67) evaluated in Core Needle Biopsy (CNB) before NAT. The aim of this study was to investigate whether NAT induces some selective changes in the breast biomarkers. Methods: We collected the appropriate data for 52 patients that conform to the requirements from the personal hospital files, since 2007 until 2016. Formalin fixed paraffin embedded samples or fresh tissue samples were used from tumors before and after surgery. Ki67 was evaluated using immunohistochemically testing. The antibody-antigen interaction is observed using chromogenic detection, an enzyme (DAB) conjugated to the antibody to produce a colored precipitate at the location of the antigen. Results: Mean age of patients was 52.3 ± 13.9. Ethnicity: 28 (53.8%) women were Jews and 24 (46.2) were Arabs. 56% of women were premenopausal, 44% postmenopausal. Lumpectomy was done in 39 (75%) of patients while the others (25%) had mastectomy. Mean level of Ki67 in the primary tumor was 34.8 ± 26.1 %, after NAT was 17.8 ± 22.9% (P < 0.001). Conclusions: In this study we found significant changes in Ki67 expression between the pretreatment biopsy specimens and the resected specimens of breast cancer patients who underwent neoadjuvant therapy. This discordance in the expression of Ki6 may affect the choice of postoperative adjuvant treatment and may be used as a prognostic factor for response.


Jamal Zidan earned his doctorate in medicine (MD) at the Semmelweis University in Budapest, Hungary. His speciality is Oncology. He is a full professor at the Faculty of Medicine in the Galilee, Safed, Bar-llan University, Israel. Head of Oncology Division at Ziv Medical center, Safed, Israel. Prof. Zidan has over 170 publications. He has received many honors as: “ Eminent Scientist & Outstanding Scholar of the year 2001” International award of IRPC; International Research Promotion Council Asia-Pacific Chapter, World Scientists Forum International Award, Gold Medal. His main research interest is molecular biomarkers, targeting therapy, breast cancer and other issues in cancer.

E-mail: [email protected]

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